The Gisin-Percival stochastic Schrödinger equation from standard quantum filtering theory.

We show that the quantum state diffusion equation of Gisin and Percival, driven by complex Wiener noise, is equivalent up to a global stochastic phase to quantum trajectory models. With an appropriate feedback scheme, we set up an analog continuous measurement model which exactly simulates the Gisin-Percival quantum state diffusion. [ABSTRACT FROM AUTHOR]